| 초록 |
The replacement of hydrogen atoms with electronegative fluorine (F) can attain the intramolecular noncovalent interactions in conjugated polymer structure employing the concept of conformational locks. Furthermore, since F atoms have a strong electron-withdrawing nature and the highest electronegativity, fluorinated analogs exhibit deeper-lying HOMO energy levels without significant changes to their band-gap, thus affording higher Voc values without deterioration of their Jsc. In this work, PIIDFBT containing F moiety exhibited a greatly enhanced photovoltaic performance and an impressively high Voc of up to 1.01 V, compared to that of its nonfluorinated analog. The high Voc of over 1.0 V is unambiguously ascribed to the fluorinated moiety in the polymer backbone and highlights the great potential of such polymers as highly efficient solar cells. |
